diff options
Diffstat (limited to 'libavformat/udp.c')
| -rw-r--r-- | libavformat/udp.c | 128 |
1 files changed, 124 insertions, 4 deletions
diff --git a/libavformat/udp.c b/libavformat/udp.c index bd95a811de..cbf3b434d5 100644 --- a/libavformat/udp.c +++ b/libavformat/udp.c @@ -2,20 +2,20 @@ * UDP prototype streaming system * Copyright (c) 2000, 2001, 2002 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -29,11 +29,17 @@ #include "avformat.h" #include "avio_internal.h" #include "libavutil/parseutils.h" +#include "libavutil/fifo.h" #include <unistd.h> #include "internal.h" #include "network.h" #include "os_support.h" #include "url.h" + +#if HAVE_PTHREADS +#include <pthread.h> +#endif + #include <sys/time.h> #ifndef IPV6_ADD_MEMBERSHIP @@ -51,6 +57,14 @@ typedef struct { struct sockaddr_storage dest_addr; int dest_addr_len; int is_connected; + + /* Circular Buffer variables for use in UDP receive code */ + int circular_buffer_size; + AVFifoBuffer *fifo; + int circular_buffer_error; +#if HAVE_PTHREADS + pthread_t circular_buffer_thread; +#endif } UDPContext; #define UDP_TX_BUF_SIZE 32768 @@ -298,6 +312,66 @@ static int udp_get_file_handle(URLContext *h) return s->udp_fd; } +static void *circular_buffer_task( void *_URLContext) +{ + URLContext *h = _URLContext; + UDPContext *s = h->priv_data; + fd_set rfds; + struct timeval tv; + + for(;;) { + int left; + int ret; + int len; + + if (url_interrupt_cb()) { + s->circular_buffer_error = EINTR; + return NULL; + } + + FD_ZERO(&rfds); + FD_SET(s->udp_fd, &rfds); + tv.tv_sec = 1; + tv.tv_usec = 0; + ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv); + if (ret < 0) { + if (ff_neterrno() == AVERROR(EINTR)) + continue; + s->circular_buffer_error = EIO; + return NULL; + } + + if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds))) + continue; + + /* How much do we have left to the end of the buffer */ + /* Whats the minimum we can read so that we dont comletely fill the buffer */ + left = av_fifo_space(s->fifo); + left = FFMIN(left, s->fifo->end - s->fifo->wptr); + + /* No Space left, error, what do we do now */ + if( !left) { + av_log(h, AV_LOG_ERROR, "circular_buffer: OVERRUN\n"); + s->circular_buffer_error = EIO; + return NULL; + } + + len = recv(s->udp_fd, s->fifo->wptr, left, 0); + if (len < 0) { + if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) { + s->circular_buffer_error = EIO; + return NULL; + } + } + s->fifo->wptr += len; + if (s->fifo->wptr >= s->fifo->end) + s->fifo->wptr = s->fifo->buffer; + s->fifo->wndx += len; + } + + return NULL; +} + /* put it in UDP context */ /* return non zero if error */ static int udp_open(URLContext *h, const char *uri, int flags) @@ -325,6 +399,8 @@ static int udp_open(URLContext *h, const char *uri, int flags) s->ttl = 16; s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE; + s->circular_buffer_size = 7*188*4096; + p = strchr(uri, '?'); if (p) { if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) { @@ -350,6 +426,9 @@ static int udp_open(URLContext *h, const char *uri, int flags) if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { s->is_connected = strtol(buf, NULL, 10); } + if (av_find_info_tag(buf, sizeof(buf), "buf_size", p)) { + s->circular_buffer_size = strtol(buf, NULL, 10)*188; + } } /* fill the dest addr */ @@ -431,10 +510,23 @@ static int udp_open(URLContext *h, const char *uri, int flags) } s->udp_fd = udp_fd; + +#if HAVE_PTHREADS + if (!is_output && s->circular_buffer_size) { + /* start the task going */ + s->fifo = av_fifo_alloc(s->circular_buffer_size); + if (pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h)) { + av_log(h, AV_LOG_ERROR, "pthread_create failed\n"); + goto fail; + } + } +#endif + return 0; fail: if (udp_fd >= 0) closesocket(udp_fd); + av_fifo_free(s->fifo); av_free(s); return AVERROR(EIO); } @@ -443,6 +535,32 @@ static int udp_read(URLContext *h, uint8_t *buf, int size) { UDPContext *s = h->priv_data; int ret; + int avail; + fd_set rfds; + struct timeval tv; + + if (s->fifo) { + + do { + avail = av_fifo_size(s->fifo); + if (avail) { // >=size) { + + // Maximum amount available + size = FFMIN( avail, size); + av_fifo_generic_read(s->fifo, buf, size, NULL); + return size; + } + else { + FD_ZERO(&rfds); + FD_SET(s->udp_fd, &rfds); + tv.tv_sec = 1; + tv.tv_usec = 0; + ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv); + if (ret<0) + return ret; + } + } while( 1); + } if (!(h->flags & AVIO_FLAG_NONBLOCK)) { ret = ff_network_wait_fd(s->udp_fd, 0); @@ -450,6 +568,7 @@ static int udp_read(URLContext *h, uint8_t *buf, int size) return ret; } ret = recv(s->udp_fd, buf, size, 0); + return ret < 0 ? ff_neterrno() : ret; } @@ -481,6 +600,7 @@ static int udp_close(URLContext *h) if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr); closesocket(s->udp_fd); + av_fifo_free(s->fifo); av_free(s); return 0; } |